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Additive for electrolytic copper foil as well as application thereof, electrolytic copper foil as well as preparation method thereof and application thereof and lithium ion battery

A lithium-ion battery and electrolytic copper foil technology, which is applied in the field of electrolytic copper foil, can solve the problems of uneven thickness of copper foil, high warpage, and tearing of copper foil, and achieve uniform thickness, no tearing, and low roughness The effect of degree and warpage

Active Publication Date: 2020-06-16
HUBEI ZHONGYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current process of producing ultra-thin electrolytic copper foil (such as a thickness of 6 microns), it is easy to cause problems such as edge tearing of the copper foil, uneven thickness of the copper foil, wrinkling, and high warpage. Therefore, in addition to mechanical precision, the expected The purpose is to provide an electrolytic copper foil with high tensile strength, elongation, low roughness and warpage. The design and selection of electrolytic additives are very important to the performance of electrolytic copper foil, which can solve the above problems at least one of

Method used

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  • Additive for electrolytic copper foil as well as application thereof, electrolytic copper foil as well as preparation method thereof and application thereof and lithium ion battery
  • Additive for electrolytic copper foil as well as application thereof, electrolytic copper foil as well as preparation method thereof and application thereof and lithium ion battery
  • Additive for electrolytic copper foil as well as application thereof, electrolytic copper foil as well as preparation method thereof and application thereof and lithium ion battery

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preparation example Construction

[0065] According to a third aspect of the present invention, a method for preparing an electrolytic copper foil is provided, comprising the following steps:

[0066] adding additive A and additive B into the electrolyte, electrolytically making foil, and obtaining electrolytic copper foil;

[0067] Wherein, the copper ion content in the electrolyte is 60-120g / L, the sulfuric acid content is 80-150g / L, and the chloride ion content is 10-30ppm.

[0068] It should be noted that the electrolyte can be obtained by adding hydrochloric acid to the copper sulfate electrolyte. Among them, the temperature for preparing the electrolyte is 45-55°C, and the typical but non-limiting temperatures for preparing the electrolyte are 45°C, 46°C, 47°C, 48°C, 49°C, 50°C, 51°C, 51°C, 52°C , 53°C or 55°C; the electrolyte can be effectively prepared by adjusting the temperature reasonably.

[0069] In the present invention, the electrolytic copper foil can be obtained by adding the additive A and t...

Embodiment 1

[0087] (1) Additives for electrolytic copper foil

[0088] An additive for electrolytic copper foil, including additive A and additive B.

[0089] Wherein, additive A includes 3-mercapto-1-propanesulfonate sodium MPS and polyethyleneimine alkyl compound GISS, and the weight ratio of MPS and GISS is 17:5;

[0090] Additive B includes gelatin G (the number average molecular weight is 1500) and tea polyphenol TP, and the weight ratio of G and TP is 11:0.1.

[0091] (2) Preparation of additive aqueous solution for electrolytic copper foil

[0092] An aqueous solution of an additive for electrolytic copper foil, comprising an aqueous solution of additive A and an aqueous solution of additive B.

[0093] MPS and GISS with a weight ratio of 17:5 were dissolved in water to obtain an aqueous solution of additive A, wherein the content of MPS was 17 g / L and the content of GISS was 5 g / L.

[0094] G and TP with a weight ratio of 11:0.1 were dissolved in hot water at 50°C to obtain an ...

Embodiment 2

[0110] (1) Preparation of additive aqueous solution for electrolytic copper foil

[0111] An aqueous solution of an additive for electrolytic copper foil, comprising an aqueous solution of additive A and an aqueous solution of additive B.

[0112] MPS and GISS with a weight ratio of 13:8 were dissolved in water to obtain an aqueous solution of additive A, wherein the content of MPS was 13 g / L and the content of GISS was 8 g / L.

[0113] G and TP with a weight ratio of 15:0.5 were dissolved in water at 50° C. to obtain an aqueous solution of additive B, wherein the content of G was 15 g / L and the content of TP was 0.5 g / L.

[0114] (2) Preparation method of electrolytic copper foil

[0115] A preparation method of electrolytic copper foil, comprising the following steps:

[0116] ① Preparation of electrolyte: add hydrochloric acid to copper sulfate electrolyte to obtain electrolyte, and the preparation temperature is 45°C; filter the obtained electrolyte and add it to the clea...

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Abstract

The invention provides an additive for an electrolytic copper foil as well as application thereof, the electrolytic copper foil as well as a preparation method thereof and application thereof and a lithium ion battery, and belongs to the technical field of electrolytic copper foils. The additive for electrolytic copper foil provided by the invention comprises an additive A and an additive B, wherein the additive A comprises a grain refiner and a polyethylenimine alkyl compound in a weight ratio of (6-17) to (1-10); and the additive B comprises gelatin and tea polyphenol in a weight ratio of (8-15) to (0.01-1). While the additive for the electrolytic copper foil is used for preparing the electrolytic copper foil, the electrolytic copper foil with a thickness of only 5-8 [mu]m can be prepared; and moreover, the obtained electrolytic copper foil has high tensile strength and ductility, has low roughness and warping degree, is uniform in thickness, is free of an edge tearing phenomenon, and is fine in crystal.

Description

technical field [0001] The invention belongs to the technical field of electrolytic copper foil, and in particular relates to an additive for electrolytic copper foil and its application, electrolytic copper foil and its preparation method and application, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in people's daily electronic products and power vehicles. With the increasing production of lithium-ion batteries, ultra-thin electrolytic copper foil is the key material for the manufacture of high-quality lithium-ion battery anode current collectors. It is not only the carrier of lithium-ion battery anode materials, but also responsible for the collection and transmission of electrons. Its quality The impact on lithium-ion battery cells is critical. [0003] In order to further increase the energy density of lithium-ion batteries, it is necessary to reduce the weight of the current collector and increase the weight of th...

Claims

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Application Information

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IPC IPC(8): C25D1/04C25D3/38H01M4/66H01M10/0525
CPCC25D1/04C25D3/38H01M4/661H01M10/0525Y02E60/10
Inventor 王锋丁瑜付争兵
Owner HUBEI ZHONGYI TECH
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